EP0638394B1 - Hydro-Impulsschrauber mit Selbst-Abschalt-Vorrichtung - Google Patents

Hydro-Impulsschrauber mit Selbst-Abschalt-Vorrichtung Download PDF

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Publication number
EP0638394B1
EP0638394B1 EP93112668A EP93112668A EP0638394B1 EP 0638394 B1 EP0638394 B1 EP 0638394B1 EP 93112668 A EP93112668 A EP 93112668A EP 93112668 A EP93112668 A EP 93112668A EP 0638394 B1 EP0638394 B1 EP 0638394B1
Authority
EP
European Patent Office
Prior art keywords
oil pressure
pressure
wrench
electric control
pulse
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93112668A
Other languages
English (en)
French (fr)
Other versions
EP0638394A1 (de
Inventor
Masaji C/O Fuji Kuuki Kabushiki Kaisha Ohta
Toshikazu C/O Fuji Kuuki Kabushiki Kaisha Kitamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Kuki KK
Fuji Air Tools Co Ltd
Original Assignee
Fuji Kuki KK
Fuji Air Tools Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Kuki KK, Fuji Air Tools Co Ltd filed Critical Fuji Kuki KK
Priority to EP93112668A priority Critical patent/EP0638394B1/de
Priority to US08/102,903 priority patent/US5421240A/en
Priority to DE1993618149 priority patent/DE69318149T2/de
Publication of EP0638394A1 publication Critical patent/EP0638394A1/de
Application granted granted Critical
Publication of EP0638394B1 publication Critical patent/EP0638394B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
    • B25B23/1453—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers for impact wrenches or screwdrivers

Definitions

  • an oil pressure pulse corresponding to the torque of the main shaft read by the reading means is directly compared with the set pressure, and if the oil pressure pulse exceeds the set pressure, the output from the electrical control means delivers a signal for the shut-off means to stop the feeding of fluid to the fluid pressure motor, thereby stopping the rotation of the fluid pressure motor.
  • the number of generated oil pressure pulses exceeding the set pressure by the electric control means is monitored to ensure that a sufficient tightening force is transmitted from the main shaft to a bolt or nut.
  • the reading means can be inexpensively produced.
  • the handling of the reading means becomes easier.
  • the battery since the battery is contained in the housing, there is no need of extending the electric wiring out of the housing to feed the electric control circuit (electric control means).
  • the pulse generating mechanism 3 is designed so that it intermittently transmits the rotational output from the air motor 1 to the main shaft 4 and each time it imparts the torque to the main shaft 4, it generates an oil pressure pulse which matches this torque.
  • a top cover 32 defining an oil pressure pulse transmitting chamber 31 is centrally provided with a small-diameter piston 33 opposed to the piston 35 of a hydraulic cylinder 34 with the air motor 1 disposed therebetween. These pistons 33 and 35 are connected together by a transmission rod 36 extending centrally through the air motor 1.
  • the oil pressure chamber 37 of the hydraulic cylinder 34 has a pressure sensor 5 disposed therein which is an example of means for reading oil pressure pulses generated in the high pressure chamber. The oil pressure pulses read by the pressure sensor 5 are processed in an electric control circuit 6.
  • One side of the stopping switching valve 9 is connected to the air passageway 14d or check valve 27. Further, the electric control circuit 6 and the battery 61 are connected together through a pressure switch 62.
  • This pressure switch 62 has the function of maintaining electrical conduction when the air passageway 24d is in the high pressure state and cutting off the electrical conduction when the air passageway 24d is in the low pressure state.
  • the electric control circuit 6 shown in Fig. 3 comprises a unit 67 for retaining data whose values have been set by the setting switch 63, an A/D converter 68, and comparison operation unit 65.
  • the electric control circuit 6 shown in Fig. 4 includes a microcomputer 69 substituted for the comparison operation unit 65 of Fig. 3.
  • Oil pulses generated in the high pressure chamber of the pulse generating mechanism 3 depress the piston 33 in the oil pressure pulse transmitting chamber 33. Since this results in the piston 35 being depressed by the transmitting rod 36, the then-prevailing pressure in the hydraulic cylinder 34, i.e., said oil pressure pulses are read by the pressure sensor and the output signal from the latter is fed into the electric control circuit 6.
  • the set value for pressure is compared with oil pressure pulses read by the pressure sensor 5. As long as the oil pressure pulses read by the pressure sensor 5 are lower than the lower limit value, the said operating state is maintained. Further, if the oil pressure pulse value read by the pressure sensor 5 is higher than the upper limit value, the then-prevailing operation is regarded as NG, whereupon the operation is instantly stopped and this stoppage is indicated. If the number of times when an oil pressure pulse read by the pressure sensor 5 is higher than the set number of times, then this is detected by the counting means 66 which delivers an output.
  • the solenoid 71 is energized to switch the switching valve 7, whereby the stopping switching valve 9 is switched, resulting in one end of the stopping differential pressure valve 8 being communicatively connected to a discharge port 82.
  • the stopping differential pressure valve 8 is switched to stop the feeding of air to the air motor 1 (autoshut-off function), and concurrently therewith, the pressure in the air passageway 24d is decreased to turn off the pressure switch 62, thereby shutting off passage of electric current to the the electric control circuit 6.
  • the reading means use has been made of the pressure sensor 5 which detects oil pressure transmitted by the thrust of an oil pressure pulse; however, a load cell which produces compressive strains owing to an oil pressure transmitted by the thrust of an oil pressure pulse may be substituted for the pressure sensor 5. And a load cell is more advantageous from the standpoint of the attachment construction and handling, while the pressure sensor 5 is more advantageous from the standpoint of cost.
  • the oil pressure at the time of generation of a pulse which forms the basis of a generated torque for the oil pressure type pulse wrench is detected and on the basis of the data thus obtained, torque control is effected; therefore, torque control with higher accuracy can be attained.
  • oil pressure pulses higher than that value are applied to a bolt or nut several times; thus, more reliable tightening can be effected.
  • the reading means can be inexpensively constructed, the handling of the reading means is facilitated, and a breakage of the electric wiring for feeding current to the electric control circuit can be prevented.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Claims (7)

  1. Öldruck-Impulsschrauber mit
    einem Fluiddruck-Motor (1),
    einer Fluiddruck-Schaltung (2) zum Steuern des Fluiddruck-Motors (1),
    einem Impulserzeugungsmechanismus (3) zum intermittierenden Übertragen der Drehleistung auf eine Hauptwelle (4) mittels eines erzeugten Impulses, um der Hauptwelle Drehmoment zu übermitteln, und
    einer Selbstabschalteeinrichtung zum Steuern des Drehmoments auf der Hauptwelle (4),
       dadurch gekennzeichnet, daß die Selbstabschalteeinrichtung
    eine Einrichtung (5) zum Auslesen der von dem Impulserzeugungsmechanismus (3) erzeugten Öldruckimpulse,
    eine elektrische Steuereinrichtung (6) zum Vergleichen der von der Ausleseeinrichtung (5) ausgelesenen Öldruckimpulse mit einem Ansprechdruck, wobei die elektrische Steuereinrichtung (6) mit einer Zähleinrichtung (66) versehen ist, die ein Signal ausgibt, wenn die Öldruckimpulse den Ansprechdruck in einer vorbestimmten Anzahl überschreiten, und eine Abschalteinrichtung (7, 8, 9) zum Unterbrechen der Fluidzufuhr zum Fluiddruck-Motor (1) in Reaktion auf das Signal von der Zähleinrichtung (66), das anzeigt, daß die Öldruckimpulse den vorbestimmten Ansprechdruck in einer vorbestimmten Anzahl überschritten haben,
    aufweist.
  2. Schrauber gemäß Anspruch 1, wobei die elektrische Steuereinrichtung (6) die oberen und unteren Grenzwerte des Ansprechdrucks festlegen kann und den unteren Grenzwert während der Steuerung der Zähleinrichtung (66) verwendet, wobei der Aufbau so ist, daß ein NG Signal abgegeben wird, wenn der Öldruckimpuls den oberen Grenzwert des Ansprechdrucks übersteigt.
  3. Schrauber gemäß Anspruch 1 oder 2, wobei die Ausleseeinrichtung (5) ein Drucksensor zum Aufnehmen des Fluiddrucks, der durch den Schub der Öldruckimpulse übertragen wird, ist.
  4. Schrauber gemäß Anspruch 1 oder 2, wobei die Ausleseeinrichtung (5) eine Schubkraftmeßeinrichtung ist, die Druckverformungen aufgrund des Fluiddrucks, der durch den Schub der Öldruckimpulse übertragen wird, erzeugen kann.
  5. Schrauber gemäß einem der vorstehenden Ansprüche, wobei die Energiequelle für die elektrische Steuereinrichtung (6) eine in einem Gehäuse (10) enthaltene Batterie (61) ist.
  6. Schrauber gemäß einem der vorstehenden Ansprüche, wobei der Fluiddruck-Motor (1) ein Druckmotor ist.
  7. Schrauber gemäß einem der vorstehenden Ansprüche, wobei die Selbstabschalteinrichtung (7, 8, 9) ein solenoidgesteuertes Schaltventil (7) enthält.
EP93112668A 1993-08-06 1993-08-06 Hydro-Impulsschrauber mit Selbst-Abschalt-Vorrichtung Expired - Lifetime EP0638394B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP93112668A EP0638394B1 (de) 1993-08-06 1993-08-06 Hydro-Impulsschrauber mit Selbst-Abschalt-Vorrichtung
US08/102,903 US5421240A (en) 1993-08-06 1993-08-06 Autoshut-off device for oil pressure type pulse wrench
DE1993618149 DE69318149T2 (de) 1993-08-06 1993-08-06 Hydro-Impulsschrauber mit Selbst-Abschalt-Vorrichtung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP93112668A EP0638394B1 (de) 1993-08-06 1993-08-06 Hydro-Impulsschrauber mit Selbst-Abschalt-Vorrichtung
US08/102,903 US5421240A (en) 1993-08-06 1993-08-06 Autoshut-off device for oil pressure type pulse wrench

Publications (2)

Publication Number Publication Date
EP0638394A1 EP0638394A1 (de) 1995-02-15
EP0638394B1 true EP0638394B1 (de) 1998-04-22

Family

ID=26133358

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93112668A Expired - Lifetime EP0638394B1 (de) 1993-08-06 1993-08-06 Hydro-Impulsschrauber mit Selbst-Abschalt-Vorrichtung

Country Status (2)

Country Link
US (1) US5421240A (de)
EP (1) EP0638394B1 (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592396A (en) * 1992-08-10 1997-01-07 Ingersoll-Rand Company Monitoring and control of fluid driven tools
BE1007527A3 (fr) * 1993-10-29 1995-07-25 Daniel Octaaf Ghisla Torrekens Procede et dispositif de commande d'un verin a double effet actionne par un fluide sous pression.
US5531279A (en) * 1994-04-12 1996-07-02 Indresco Inc. Sensor impulse unit
US6302129B1 (en) 2000-06-05 2001-10-16 John S. Van Dewerker Pulse sensing feedback control system
US20030177845A1 (en) * 2000-10-16 2003-09-25 Edward Dziedzic Torque measurement of hydraulic installer of earth anchor
DE10222159A1 (de) * 2002-05-17 2003-11-27 Paul-Heinz Wagner Verfahren zur Steuerung einer hydraulischen Kolbenzylindereinheit
US7146715B2 (en) * 2004-08-03 2006-12-12 Avk Industrial Products Spin pressure power tool
SE532449C2 (sv) * 2008-05-14 2010-01-19 Atlas Copco Tools Ab Pneumatisk impulsmutterdragare med arbetsstyrorgan
US8201464B2 (en) * 2008-09-02 2012-06-19 Easco Hand Tools Inc Electronic torque wrench with a manual input device
EP2305430A1 (de) * 2009-09-30 2011-04-06 Hitachi Koki CO., LTD. Drehschlagwerkzeug
TWI516342B (zh) * 2013-10-04 2016-01-11 Tranmax Machinery Co Ltd Hydraulic power tool with speed and speed function
EP4276310A3 (de) 2017-05-16 2024-01-17 Enerpac Tool Group Corp. Hydraulikpumpe
ES2940784T3 (es) 2018-11-13 2023-05-11 Enerpac Tool Group Corp Sistema de energía hidráulica y método para controlar el mismo

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3116617A (en) * 1961-12-12 1964-01-07 Ingersoll Rand Co Fluid impulse torque tool
US3334487A (en) * 1965-09-07 1967-08-08 Ingersoll Rand Co Impulse tool with improved cut-off device
US3368631A (en) * 1965-10-14 1968-02-13 Ingersoll Rand Co Torque control apparatus for impulse tools
US3572447A (en) * 1968-11-12 1971-03-30 Ingersoll Rand Co Torque measuring system for impact wrench
US3596718A (en) * 1969-07-02 1971-08-03 Gardner Denver Co Torque control system
DE3170928D1 (en) * 1981-07-17 1985-07-18 Giken Kogyo Kk Fluid impulse torque tool
US4604943A (en) * 1985-02-04 1986-08-12 Ingersoll-Rand Company Impulse tool having shut off system
DE3717630A1 (de) * 1987-05-26 1988-12-15 Gardner Denver Gmbh Hydro-impulsschrauber
US5113949A (en) * 1988-10-12 1992-05-19 Fuji Kuuki Kabushiki Kaisha Tightening control apparatus for a torque wrench
DE69022626T2 (de) * 1989-05-15 1996-03-21 Uryu Seisaku Ltd Drucküberwachungsmittel für Drehmoment-Schraubenschlüssel.
JPH04109867U (ja) * 1991-03-07 1992-09-24 瓜生製作株式会社 トルク制御式インパクトレンチ
US5277261A (en) * 1992-01-23 1994-01-11 Makita Corporation Tightening tool

Also Published As

Publication number Publication date
US5421240A (en) 1995-06-06
EP0638394A1 (de) 1995-02-15

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